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catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 2245
Experience:  Field service technician for CAT 19 years.
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I have a D7R that has an engine control problem. It started

Customer Question

I have a D7R that has an engine control problem. It started to act up suddenly. When I hit the rabbit mode on the throttle control it revev up but then goes down to 900 rpm and the fault light comes on. Cat dealer told me it was a faulty switch, changed it and still the same.
Andy
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  catmastertech replied 1 year ago.

Hello, the fault may be in the wiring. Have you inspected the harnesses? Please post the full machine serial number and the fault codes you currently have active so I can help you further.

Customer: replied 1 year ago.
I have given the wiring at control toggle switch the D7R s/n is ABJ 00599
Fault codes are:
(###) ###-####02 (###) ###-####33 (###) ###-####02 (###) ###-####00 (###) ###-####02 (###) ###-####03Thanks,Andy
Expert:  catmastertech replied 1 year ago.

The follow code is related to your issue. This is likely from a damaged harness.

CID 0091 FMI 02 Incorrect Throttle Switch inputs

Conditions Which Generate This Code:

The Electronic Control Module (ECM) detects the following conditions:

  • Either both switches have been open for 1.8 seconds or both switches have been closed for 1.8 seconds.

     

  • The ECM has been powered for at least three seconds.

     

System Response:

The ECM will log the diagnostic code. The throttle switch will be ignored.

  • Reduced engine speed

     

Note: If the engine is being operated above 1000 rpm, the ECM will drop the engine speed to 1000 rpm. If the engine is being operated below 1000 rpm, the ECM will maintain the engine speed. The decelerator pedal modulates to 700 rpm.

Expert:  catmastertech replied 1 year ago.

Have you tested the throttle circuits?

Expert:  catmastertech replied 1 year ago.

Here is the complete test procedure. (see attached file.)

If you need further help, please let me know.

Thanks, Donnie

Customer: replied 1 year ago.
Thanks Donnie,I'll head out to the machine later to test it.-Andy
Expert:  catmastertech replied 1 year ago.

Ok, thanks.

If you need further help, please feel free to ask.

(Please remember to rate my answer to close the question. If you have a problem, the link normally still works afterward.)

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